Nsm ES 4 TB socket

Hi, I hope someone can help me with this Old jukebox. I have been trying to connect a aux device through the TB socket.
This is so I can use a touch screen computer with xbmc installed. I had a 8 pin din cable specially made for this and it is not working. All it does is deactivate the Jukebox cd when it is plugged in.
I wish the Es 4 had the same standard socket as the Es 5 ect.
I was hoping to not have to setup another amp and speakers in the same room.

Any help would be great thanks

Danke .. Thankyou